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open() equivalent of fopen(..., "w")

Question Text​

Use strace on the code in support/simple-file-operations/file_operations.c to find the flags used by openat() when calling fopen(file_name, "w"). First, try to make an educated guess and only then verify your answer by running strace.

Question Answers​

  • O_WRONLY | O_CREAT | O_TRUNC

  • O_WRONLY | O_CREAT

  • O_WRONLY

  • O_WRONLY | O_TRUNC

Feedback​

student@os:~/.../lab/support/simple-file-operations$ strace ./file_operations
[...]
openat(AT_FDCWD, "file.txt", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
[...]